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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905b80bb9ec83336317e56a9ba41a2a715c1bf66e6196c2fb19c89f31d6d4773' 
  AND token = 'Gfc0/1o7tg+58CjlQddFsIgNBGnoTwuFgrlGrDkUEnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}